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Sudoku is a japanese puzzle game that demands both strategy and logic.

A sudoku consists of a 9x9 grid that contain small subgrids of 3x3 elements each.

Depending on the difficulty of the puzzle, a small or large number of cells will already contain digits.

In order to solve a sudoku, the numbers of 1 to 9 have to be inserted into every subgrid in such a manner that every row, every column and every 3x3 box accommodates only one instance of each digit.

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